Medical instruments for tissue cauterization

ABSTRACT

Certain aspects relate to systems and techniques for an articulating monopolar medical instrument. In one aspect, the medical instrument includes a wrist comprising a proximal clevis and a distal clevis; an end effector coupled to the distal clevis via a distal axle; at least one proximal pulley in the proximal clevis; at least one distal pulley in the distal clevis and coupled to the distal axle; a first cable configured to engage with the at least one proximal pulley and the at least one distal pulley; and a second cable configured to engage with the at least one proximal pulley without engaging the at least one distal pulley.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No. 16/454,632, filed Jun. 27, 2019, which claims the benefit of U.S. Provisional Application No. 62/764,744, filed Aug. 15, 2018, each of which is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The systems and methods disclosed herein are directed to a medical instrument, and more particularly to a medical instrument for cauterizing tissue.

BACKGROUND

Medical procedures, such as laparoscopy, may involve accessing and visualizing an internal region of a patient. In a laparoscopic procedure, a medical instrument can be inserted into the internal region through a laparoscopic access port.

In certain procedures, a robotically-enabled medical system may be used to control the insertion and/or manipulation of the medical instrument and end effector, such as a medical instrument which can cauterize tissue. The robotically-enabled medical system may include a robotic arm or any other instrument positioning device. The robotically-enabled medical system may also include a controller used to control the positioning of the instrument during the procedure and control a current supplied to the end effector to control cauterization of tissue.

SUMMARY

The systems, methods and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.

In one aspect, there is provided a medical instrument comprising a wrist comprising a proximal clevis and a distal clevis; an end effector coupled to the distal clevis via a distal axle; at least one proximal pulley in the proximal clevis; at least one distal pulley in the distal clevis and coupled to the distal axle; a first cable configured to engage with the at least one proximal pulley and the at least one distal pulley; and a second cable configured to engage with the at least one proximal pulley without engaging the at least one distal pulley.

In another aspect, there is provided a method of actuating an end effector in multiple degrees of movement, the method comprising advancing or retracting at least one first cable segment that engages at least one proximal pulley and at least one distal pulley of an instrument, the instrument comprising a wrist including a proximal clevis and a distal clevis, the end effector coupled to the distal clevis, the at least one proximal pulley located in the proximal clevis, and the at least one distal pulley located in the distal clevis; and advancing or retracting at least one second cable segment that engages the at least one proximal pulley without engaging the at least one distal pulley.

In yet another aspect, there is provided a medical instrument comprising a wrist comprising a proximal clevis and a distal clevis; an end effector coupled to the distal clevis via a distal axle; at least one proximal pulley in the proximal clevis; at least one distal pulley in the distal clevis and coupled to the distal axle; and at least one cable segment configured to engage the at least one proximal pulley and the at least one distal pulley, and to extend along a substantially linear path between the at least one proximal pulley and the at least one distal pulley.

In still yet another aspect, there is provided a medical instrument comprising a wrist comprising a proximal clevis and a distal clevis; an end effector coupled to the distal clevis via a distal axle; at least one proximal pulley in the proximal clevis; and at least one distal pulley in the distal clevis and coupled to the distal axle, wherein the end effector comprises a hook, the hook comprises a first link and a second link, and the first link has a longitudinal axis offset from a rotational axis extending through the at least one distal pulley.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosed aspects will hereinafter be described in conjunction with the appended drawings, provided to illustrate and not to limit the disclosed aspects, wherein like designations denote like elements.

FIG. 1 illustrates an embodiment of a cart-based robotic system arranged for diagnostic and/or therapeutic bronchoscopy.

FIG. 2 depicts further aspects of the robotic system of FIG. 1.

FIG. 3 illustrates an embodiment of the robotic system of FIG. 1 arranged for ureteroscopy.

FIG. 4 illustrates an embodiment of the robotic system of FIG. 1 arranged for a vascular procedure.

FIG. 5 illustrates an embodiment of a table-based robotic system arranged for a bronchoscopic procedure.

FIG. 6 provides an alternative view of the robotic system of FIG. 5.

FIG. 7 illustrates an example system configured to stow robotic arm(s).

FIG. 8 illustrates an embodiment of a table-based robotic system configured for a ureteroscopic procedure.

FIG. 9 illustrates an embodiment of a table-based robotic system configured for a laparoscopic procedure.

FIG. 10 illustrates an embodiment of the table-based robotic system of FIGS. 5-9 with pitch or tilt adjustment.

FIG. 11 provides a detailed illustration of the interface between the table and the column of the table-based robotic system of FIGS. 5-10.

FIG. 12 illustrates an alternative embodiment of a table-based robotic system.

FIG. 13 illustrates an end view of the table-based robotic system of FIG. 12.

FIG. 14 illustrates an end view of a table-based robotic system with robotic arms attached thereto.

FIG. 15 illustrates an exemplary instrument driver.

FIG. 16 illustrates an exemplary medical instrument with a paired instrument driver.

FIG. 17 illustrates an alternative design for an instrument driver and instrument where the axes of the drive units are parallel to the axis of the elongated shaft of the instrument.

FIG. 18 illustrates an instrument having an instrument-based insertion architecture.

FIG. 19 illustrates an exemplary controller.

FIG. 20 depicts a block diagram illustrating a localization system that estimates a location of one or more elements of the robotic systems of FIGS. 1-10, such as the location of the instrument of FIGS. 16-18, in accordance to an example embodiment.

FIG. 21 illustrates an exemplary medical environment in which an articulating medical instrument can be used for a medical procedure in accordance with aspects of this disclosure.

FIGS. 22A-22C illustrate a plurality of views of an embodiment of a monopolar medical instrument in accordance with aspects of this disclosure.

FIG. 23 illustrates an embodiment of a cable path which may be used to redirect the cables of the medical instrument illustrated in FIGS. 22A-22C.

FIGS. 24A-24C illustrate a plurality of embodiments of monopolar hooks which may be used in a monopolar medical instrument in accordance with aspects of this disclosure.

FIGS. 25A-25C illustrate a plurality of views of another embodiment of a distal pulley for a monopolar medical instrument in accordance with aspects of this disclosure.

FIG. 26 is a flowchart illustrating an example method operable by a robotic system, or component(s) thereof, for actuating an end effector in multiple degrees of movement in accordance with aspects of this disclosure.

DETAILED DESCRIPTION 1. Overview

Aspects of the present disclosure may be integrated into a robotically-enabled medical system capable of performing a variety of medical procedures, including both minimally invasive, such as laparoscopy, and non-invasive, such as endoscopy, procedures. Among endoscopic procedures, the system may be capable of performing bronchoscopy, ureteroscopy, gastroscopy, etc.

In addition to performing the breadth of procedures, the system may provide additional benefits, such as enhanced imaging and guidance to assist the physician. Additionally, the system may provide the physician with the ability to perform the procedure from an ergonomic position without the need for awkward arm motions and positions. Still further, the system may provide the physician with the ability to perform the procedure with improved ease of use such that one or more of the instruments of the system can be controlled by a single user.

Various embodiments will be described below in conjunction with the drawings for purposes of illustration. It should be appreciated that many other implementations of the disclosed concepts are possible, and various advantages can be achieved with the disclosed implementations. Headings are included herein for reference and to aid in locating various sections. These headings are not intended to limit the scope of the concepts described with respect thereto. Such concepts may have applicability throughout the entire specification.

A. Robotic System—Cart.

The robotically-enabled medical system may be configured in a variety of ways depending on the particular procedure. FIG. 1 illustrates an embodiment of a cart-based robotically-enabled system 10 arranged for a diagnostic and/or therapeutic bronchoscopy. During a bronchoscopy, the system 10 may comprise a cart 11 having one or more robotic arms 12 to deliver a medical instrument, such as a steerable endoscope 13, which may be a procedure-specific bronchoscope for bronchoscopy, to a natural orifice access point (i.e., the mouth of the patient positioned on a table in the present example) to deliver diagnostic and/or therapeutic tools. As shown, the cart 11 may be positioned proximate to the patient's upper torso in order to provide access to the access point. Similarly, the robotic arms 12 may be actuated to position the bronchoscope relative to the access point. The arrangement in FIG. 1 may also be utilized when performing a gastro-intestinal (GI) procedure with a gastroscope, a specialized endoscope for GI procedures. FIG. 2 depicts an example embodiment of the cart in greater detail.

With continued reference to FIG. 1, once the cart 11 is properly positioned, the robotic arms 12 may insert the steerable endoscope 13 into the patient robotically, manually, or a combination thereof. As shown, the steerable endoscope 13 may comprise at least two telescoping parts, such as an inner leader portion and an outer sheath portion, each portion coupled to a separate instrument driver (also referred to as an instrument drive mechanism (IDM)) from the set of instrument drivers 28, each instrument driver coupled to the distal end of an individual robotic arm. This linear arrangement of the instrument drivers 28, which facilitates coaxially aligning the leader portion with the sheath portion, creates a “virtual rail” 29 that may be repositioned in space by manipulating the one or more robotic arms 12 into different angles and/or positions. The virtual rails described herein are depicted in the Figures using dashed lines, and accordingly the dashed lines do not depict any physical structure of the system. Translation of the instrument drivers 28 along the virtual rail 29 telescopes the inner leader portion relative to the outer sheath portion or advances or retracts the endoscope 13 from the patient. The angle of the virtual rail 29 may be adjusted, translated, and pivoted based on clinical application or physician preference. For example, in bronchoscopy, the angle and position of the virtual rail 29 as shown represents a compromise between providing physician access to the endoscope 13 while minimizing friction that results from bending the endoscope 13 into the patient's mouth.

The endoscope 13 may be directed down the patient's trachea and lungs after insertion using precise commands from the robotic system until reaching the target destination or operative site. In order to enhance navigation through the patient's lung network and/or reach the desired target, the endoscope 13 may be manipulated to telescopically extend the inner leader portion from the outer sheath portion to obtain enhanced articulation and greater bend radius. The use of separate instrument drivers 28 also allows the leader portion and sheath portion to be driven independently of each other.

For example, the endoscope 13 may be directed to deliver a biopsy needle to a target, such as, for example, a lesion or nodule within the lungs of a patient. The needle may be deployed down a working channel that runs the length of the endoscope to obtain a tissue sample to be analyzed by a pathologist. Depending on the pathology results, additional tools may be deployed down the working channel of the endoscope for additional biopsies. After identifying a nodule to be malignant, the endoscope 13 may endoscopically deliver tools to resect the potentially cancerous tissue. In some instances, diagnostic and therapeutic treatments can be delivered in separate procedures. In those circumstances, the endoscope 13 may also be used to deliver a fiducial to “mark” the location of the target nodule as well. In other instances, diagnostic and therapeutic treatments may be delivered during the same procedure.

The system 10 may also include a movable tower 30, which may be connected via support cables to the cart 11 to provide support for controls, electronics, fluidics, optics, sensors, and/or power to the cart 11. Placing such functionality in the tower 30 allows for a smaller form factor cart 11 that may be more easily adjusted and/or re-positioned by an operating physician and his/her staff. Additionally, the division of functionality between the cart/table and the support tower 30 reduces operating room clutter and facilitates improving clinical workflow. While the cart 11 may be positioned close to the patient, the tower 30 may be stowed in a remote location to stay out of the way during a procedure.

In support of the robotic systems described above, the tower 30 may include component(s) of a computer-based control system that stores computer program instructions, for example, within a non-transitory computer-readable storage medium such as a persistent magnetic storage drive, solid state drive, etc. The execution of those instructions, whether the execution occurs in the tower 30 or the cart 11, may control the entire system or sub-system(s) thereof. For example, when executed by a processor of the computer system, the instructions may cause the components of the robotics system to actuate the relevant carriages and arm mounts, actuate the robotics arms, and control the medical instruments. For example, in response to receiving the control signal, the motors in the joints of the robotics arms may position the arms into a certain posture.

The tower 30 may also include a pump, flow meter, valve control, and/or fluid access in order to provide controlled irrigation and aspiration capabilities to the system that may be deployed through the endoscope 13. These components may also be controlled using the computer system of the tower 30. In some embodiments, irrigation and aspiration capabilities may be delivered directly to the endoscope 13 through separate cable(s).

The tower 30 may include a voltage and surge protector designed to provide filtered and protected electrical power to the cart 11, thereby avoiding placement of a power transformer and other auxiliary power components in the cart 11, resulting in a smaller, more moveable cart 11.

The tower 30 may also include support equipment for the sensors deployed throughout the robotic system 10. For example, the tower 30 may include optoelectronics equipment for detecting, receiving, and processing data received from the optical sensors or cameras throughout the robotic system 10. In combination with the control system, such optoelectronics equipment may be used to generate real-time images for display in any number of consoles deployed throughout the system, including in the tower 30. Similarly, the tower 30 may also include an electronic subsystem for receiving and processing signals received from deployed electromagnetic (EM) sensors. The tower 30 may also be used to house and position an EM field generator for detection by EM sensors in or on the medical instrument.

The tower 30 may also include a console 31 in addition to other consoles available in the rest of the system, e.g., console mounted on top of the cart. The console 31 may include a user interface and a display screen, such as a touchscreen, for the physician operator. Consoles in the system 10 are generally designed to provide both robotic controls as well as preoperative and real-time information of the procedure, such as navigational and localization information of the endoscope 13. When the console 31 is not the only console available to the physician, it may be used by a second operator, such as a nurse, to monitor the health or vitals of the patient and the operation of the system 10, as well as to provide procedure-specific data, such as navigational and localization information. In other embodiments, the console 30 is housed in a body that is separate from the tower 30.

The tower 30 may be coupled to the cart 11 and endoscope 13 through one or more cables or connections (not shown). In some embodiments, the support functionality from the tower 30 may be provided through a single cable to the cart 11, simplifying and de-cluttering the operating room. In other embodiments, specific functionality may be coupled in separate cabling and connections. For example, while power may be provided through a single power cable to the cart 11, the support for controls, optics, fluidics, and/or navigation may be provided through a separate cable.

FIG. 2 provides a detailed illustration of an embodiment of the cart 11 from the cart-based robotically-enabled system shown in FIG. 1. The cart 11 generally includes an elongated support structure 14 (often referred to as a “column”), a cart base 15, and a console 16 at the top of the column 14. The column 14 may include one or more carriages, such as a carriage 17 (alternatively “arm support”) for supporting the deployment of one or more robotic arms 12 (three shown in FIG. 2). The carriage 17 may include individually configurable arm mounts that rotate along a perpendicular axis to adjust the base of the robotic arms 12 for better positioning relative to the patient. The carriage 17 also includes a carriage interface 19 that allows the carriage 17 to vertically translate along the column 14.

The carriage interface 19 is connected to the column 14 through slots, such as slot 20, that are positioned on opposite sides of the column 14 to guide the vertical translation of the carriage 17. The slot 20 contains a vertical translation interface to position and hold the carriage 17 at various vertical heights relative to the cart base 15. Vertical translation of the carriage 17 allows the cart 11 to adjust the reach of the robotic arms 12 to meet a variety of table heights, patient sizes, and physician preferences. Similarly, the individually configurable arm mounts on the carriage 17 allow the robotic arm base 21 of the robotic arms 12 to be angled in a variety of configurations.

In some embodiments, the slot 20 may be supplemented with slot covers that are flush and parallel to the slot surface to prevent dirt and fluid ingress into the internal chambers of the column 14 and the vertical translation interface as the carriage 17 vertically translates. The slot covers may be deployed through pairs of spring spools positioned near the vertical top and bottom of the slot 20. The covers are coiled within the spools until deployed to extend and retract from their coiled state as the carriage 17 vertically translates up and down. The spring-loading of the spools provides force to retract the cover into a spool when the carriage 17 translates towards the spool, while also maintaining a tight seal when the carriage 17 translates away from the spool. The covers may be connected to the carriage 17 using, for example, brackets in the carriage interface 19 to ensure proper extension and retraction of the cover as the carriage 17 translates.

The column 14 may internally comprise mechanisms, such as gears and motors, that are designed to use a vertically aligned lead screw to translate the carriage 17 in a mechanized fashion in response to control signals generated in response to user inputs, e.g., inputs from the console 16.

The robotic arms 12 may generally comprise robotic arm bases 21 and end effectors 22, separated by a series of linkages 23 that are connected by a series of joints 24, each joint comprising an independent actuator, each actuator comprising an independently controllable motor. Each independently controllable joint represents an independent degree of freedom available to the robotic arm 12. Each of the robotic arms 12 may have seven joints, and thus provide seven degrees of freedom. A multitude of joints result in a multitude of degrees of freedom, allowing for “redundant” degrees of freedom. Having redundant degrees of freedom allows the robotic arms 12 to position their respective end effectors 22 at a specific position, orientation, and trajectory in space using different linkage positions and joint angles. This allows for the system to position and direct a medical instrument from a desired point in space while allowing the physician to move the arm joints into a clinically advantageous position away from the patient to create greater access, while avoiding arm collisions.

The cart base 15 balances the weight of the column 14, carriage 17, and robotic arms 12 over the floor. Accordingly, the cart base 15 houses heavier components, such as electronics, motors, power supply, as well as components that either enable movement and/or immobilize the cart 11. For example, the cart base 15 includes rollable wheel-shaped casters 25 that allow for the cart 11 to easily move around the room prior to a procedure. After reaching the appropriate position, the casters 25 may be immobilized using wheel locks to hold the cart 11 in place during the procedure.

Positioned at the vertical end of the column 14, the console 16 allows for both a user interface for receiving user input and a display screen (or a dual-purpose device such as, for example, a touchscreen 26) to provide the physician user with both preoperative and intraoperative data. Potential preoperative data on the touchscreen 26 may include preoperative plans, navigation and mapping data derived from preoperative computerized tomography (CT) scans, and/or notes from preoperative patient interviews. Intraoperative data on display may include optical information provided from the tool, sensor and coordinate information from sensors, as well as vital patient statistics, such as respiration, heart rate, and/or pulse. The console 16 may be positioned and tilted to allow a physician to access the console 16 from the side of the column 14 opposite the carriage 17. From this position, the physician may view the console 16, robotic arms 12, and patient while operating the console 16 from behind the cart 11. As shown, the console 16 also includes a handle 27 to assist with maneuvering and stabilizing the cart 11.

FIG. 3 illustrates an embodiment of a robotically-enabled system 10 arranged for ureteroscopy. In a ureteroscopic procedure, the cart 11 may be positioned to deliver a ureteroscope 32, a procedure-specific endoscope designed to traverse a patient's urethra and ureter, to the lower abdominal area of the patient. In a ureteroscopy, it may be desirable for the ureteroscope 32 to be directly aligned with the patient's urethra to reduce friction and forces on the sensitive anatomy in the area. As shown, the cart 11 may be aligned at the foot of the table to allow the robotic arms 12 to position the ureteroscope 32 for direct linear access to the patient's urethra. From the foot of the table, the robotic arms 12 may insert the ureteroscope 32 along the virtual rail 33 directly into the patient's lower abdomen through the urethra.

After insertion into the urethra, using similar control techniques as in bronchoscopy, the ureteroscope 32 may be navigated into the bladder, ureters, and/or kidneys for diagnostic and/or therapeutic applications. For example, the ureteroscope 32 may be directed into the ureter and kidneys to break up kidney stone build up using a laser or ultrasonic lithotripsy device deployed down the working channel of the ureteroscope 32. After lithotripsy is complete, the resulting stone fragments may be removed using baskets deployed down the ureteroscope 32.

FIG. 4 illustrates an embodiment of a robotically-enabled system 10 similarly arranged for a vascular procedure. In a vascular procedure, the system 10 may be configured such that the cart 11 may deliver a medical instrument 34, such as a steerable catheter, to an access point in the femoral artery in the patient's leg. The femoral artery presents both a larger diameter for navigation as well as a relatively less circuitous and tortuous path to the patient's heart, which simplifies navigation. As in a ureteroscopic procedure, the cart 11 may be positioned towards the patient's legs and lower abdomen to allow the robotic arms 12 to provide a virtual rail 35 with direct linear access to the femoral artery access point in the patient's thigh/hip region. After insertion into the artery, the medical instrument 34 may be directed and inserted by translating the instrument drivers 28. Alternatively, the cart may be positioned around the patient's upper abdomen in order to reach alternative vascular access points, such as, for example, the carotid and brachial arteries near the shoulder and wrist.

B. Robotic System—Table.

Embodiments of the robotically-enabled medical system may also incorporate the patient's table. Incorporation of the table reduces the amount of capital equipment within the operating room by removing the cart, which allows greater access to the patient. FIG. 5 illustrates an embodiment of such a robotically-enabled system arranged for a bronchoscopic procedure. System 36 includes a support structure or column 37 for supporting platform 38 (shown as a “table” or “bed”) over the floor. Much like in the cart-based systems, the end effectors of the robotic arms 39 of the system 36 comprise instrument drivers 42 that are designed to manipulate an elongated medical instrument, such as a bronchoscope 40 in FIG. 5, through or along a virtual rail 41 formed from the linear alignment of the instrument drivers 42. In practice, a C-arm for providing fluoroscopic imaging may be positioned over the patient's upper abdominal area by placing the emitter and detector around the table 38.

FIG. 6 provides an alternative view of the system 36 without the patient and medical instrument for discussion purposes. As shown, the column 37 may include one or more carriages 43 shown as ring-shaped in the system 36, from which the one or more robotic arms 39 may be based. The carriages 43 may translate along a vertical column interface 44 that runs the length of the column 37 to provide different vantage points from which the robotic arms 39 may be positioned to reach the patient. The carriage(s) 43 may rotate around the column 37 using a mechanical motor positioned within the column 37 to allow the robotic arms 39 to have access to multiples sides of the table 38, such as, for example, both sides of the patient. In embodiments with multiple carriages, the carriages may be individually positioned on the column and may translate and/or rotate independently of the other carriages. While the carriages 43 need not surround the column 37 or even be circular, the ring-shape as shown facilitates rotation of the carriages 43 around the column 37 while maintaining structural balance. Rotation and translation of the carriages 43 allows the system 36 to align the medical instruments, such as endoscopes and laparoscopes, into different access points on the patient. In other embodiments (not shown), the system 36 can include a patient table or bed with adjustable arm supports in the form of bars or rails extending alongside it. One or more robotic arms 39 (e.g., via a shoulder with an elbow joint) can be attached to the adjustable arm supports, which can be vertically adjusted. By providing vertical adjustment, the robotic arms 39 are advantageously capable of being stowed compactly beneath the patient table or bed, and subsequently raised during a procedure.

The robotic arms 39 may be mounted on the carriages 43 through a set of arm mounts 45 comprising a series of joints that may individually rotate and/or telescopically extend to provide additional configurability to the robotic arms 39. Additionally, the arm mounts 45 may be positioned on the carriages 43 such that, when the carriages 43 are appropriately rotated, the arm mounts 45 may be positioned on either the same side of the table 38 (as shown in FIG. 6), on opposite sides of the table 38 (as shown in FIG. 9), or on adjacent sides of the table 38 (not shown).

The column 37 structurally provides support for the table 38, and a path for vertical translation of the carriages 43. Internally, the column 37 may be equipped with lead screws for guiding vertical translation of the carriages, and motors to mechanize the translation of the carriages 43 based the lead screws. The column 37 may also convey power and control signals to the carriages 43 and the robotic arms 39 mounted thereon.

The table base 46 serves a similar function as the cart base 15 in the cart 11 shown in FIG. 2, housing heavier components to balance the table/bed 38, the column 37, the carriages 43, and the robotic arms 39. The table base 46 may also incorporate rigid casters to provide stability during procedures. Deployed from the bottom of the table base 46, the casters may extend in opposite directions on both sides of the base 46 and retract when the system 36 needs to be moved.

With continued reference to FIG. 6, the system 36 may also include a tower (not shown) that divides the functionality of the system 36 between the table and the tower to reduce the form factor and bulk of the table. As in earlier disclosed embodiments, the tower may provide a variety of support functionalities to the table, such as processing, computing, and control capabilities, power, fluidics, and/or optical and sensor processing. The tower may also be movable to be positioned away from the patient to improve physician access and de-clutter the operating room. Additionally, placing components in the tower allows for more storage space in the table base 46 for potential stowage of the robotic arms 39. The tower may also include a master controller or console that provides both a user interface for user input, such as keyboard and/or pendant, as well as a display screen (or touchscreen) for preoperative and intraoperative information, such as real-time imaging, navigation, and tracking information. In some embodiments, the tower may also contain holders for gas tanks to be used for insufflation.

In some embodiments, a table base may stow and store the robotic arms when not in use. FIG. 7 illustrates a system 47 that stows robotic arms in an embodiment of the table-based system. In the system 47, carriages 48 may be vertically translated into base 49 to stow robotic arms 50, arm mounts 51, and the carriages 48 within the base 49. Base covers 52 may be translated and retracted open to deploy the carriages 48, arm mounts 51, and robotic arms 50 around column 53, and closed to stow to protect them when not in use. The base covers 52 may be sealed with a membrane 54 along the edges of its opening to prevent dirt and fluid ingress when closed.

FIG. 8 illustrates an embodiment of a robotically-enabled table-based system configured for a ureteroscopic procedure. In a ureteroscopy, the table 38 may include a swivel portion 55 for positioning a patient off-angle from the column 37 and table base 46. The swivel portion 55 may rotate or pivot around a pivot point (e.g., located below the patient's head) in order to position the bottom portion of the swivel portion 55 away from the column 37. For example, the pivoting of the swivel portion 55 allows a C-arm (not shown) to be positioned over the patient's lower abdomen without competing for space with the column (not shown) below table 38. By rotating the carriage 35 (not shown) around the column 37, the robotic arms 39 may directly insert a ureteroscope 56 along a virtual rail 57 into the patient's groin area to reach the urethra. In a ureteroscopy, stirrups 58 may also be fixed to the swivel portion 55 of the table 38 to support the position of the patient's legs during the procedure and allow clear access to the patient's groin area.

In a laparoscopic procedure, through small incision(s) in the patient's abdominal wall, minimally invasive instruments may be inserted into the patient's anatomy. In some embodiments, the minimally invasive instruments comprise an elongated rigid member, such as a shaft, which is used to access anatomy within the patient. After inflation of the patient's abdominal cavity, the instruments may be directed to perform surgical or medical tasks, such as grasping, cutting, ablating, suturing, etc. In some embodiments, the instruments can comprise a scope, such as a laparoscope. FIG. 9 illustrates an embodiment of a robotically-enabled table-based system configured for a laparoscopic procedure. As shown in FIG. 9, the carriages 43 of the system 36 may be rotated and vertically adjusted to position pairs of the robotic arms 39 on opposite sides of the table 38, such that instrument 59 may be positioned using the arm mounts 45 to be passed through minimal incisions on both sides of the patient to reach his/her abdominal cavity.

To accommodate laparoscopic procedures, the robotically-enabled table system may also tilt the platform to a desired angle. FIG. 10 illustrates an embodiment of the robotically-enabled medical system with pitch or tilt adjustment. As shown in FIG. 10, the system 36 may accommodate tilt of the table 38 to position one portion of the table at a greater distance from the floor than the other. Additionally, the arm mounts 45 may rotate to match the tilt such that the robotic arms 39 maintain the same planar relationship with the table 38. To accommodate steeper angles, the column 37 may also include telescoping portions 60 that allow vertical extension of the column 37 to keep the table 38 from touching the floor or colliding with the table base 46.

FIG. 11 provides a detailed illustration of the interface between the table 38 and the column 37. Pitch rotation mechanism 61 may be configured to alter the pitch angle of the table 38 relative to the column 37 in multiple degrees of freedom. The pitch rotation mechanism 61 may be enabled by the positioning of orthogonal axes 1, 2 at the column-table interface, each axis actuated by a separate motor 3, 4 responsive to an electrical pitch angle command. Rotation along one screw 5 would enable tilt adjustments in one axis 1, while rotation along the other screw 6 would enable tilt adjustments along the other axis 2. In some embodiments, a ball joint can be used to alter the pitch angle of the table 38 relative to the column 37 in multiple degrees of freedom.

For example, pitch adjustments are particularly useful when trying to position the table in a Trendelenburg position, i.e., position the patient's lower abdomen at a higher position from the floor than the patient's upper abdomen, for lower abdominal surgery. The Trendelenburg position causes the patient's internal organs to slide towards his/her upper abdomen through the force of gravity, clearing out the abdominal cavity for minimally invasive tools to enter and perform lower abdominal surgical or medical procedures, such as laparoscopic prostatectomy.

FIGS. 12 and 13 illustrate isometric and end views of an alternative embodiment of a table-based surgical robotics system 100. The surgical robotics system 100 includes one or more adjustable arm supports 105 that can be configured to support one or more robotic arms (see, for example, FIG. 14) relative to a table 101. In the illustrated embodiment, a single adjustable arm support 105 is shown, though an additional arm support can be provided on an opposite side of the table 101. The adjustable arm support 105 can be configured so that it can move relative to the table 101 to adjust and/or vary the position of the adjustable arm support 105 and/or any robotic arms mounted thereto relative to the table 101. For example, the adjustable arm support 105 may be adjusted one or more degrees of freedom relative to the table 101. The adjustable arm support 105 provides high versatility to the system 100, including the ability to easily stow the one or more adjustable arm supports 105 and any robotics arms attached thereto beneath the table 101. The adjustable arm support 105 can be elevated from the stowed position to a position below an upper surface of the table 101. In other embodiments, the adjustable arm support 105 can be elevated from the stowed position to a position above an upper surface of the table 101.

The adjustable arm support 105 can provide several degrees of freedom, including lift, lateral translation, tilt, etc. In the illustrated embodiment of FIGS. 12 and 13, the arm support 105 is configured with four degrees of freedom, which are illustrated with arrows in FIG. 12. A first degree of freedom allows for adjustment of the adjustable arm support 105 in the z-direction (“Z-lift”). For example, the adjustable arm support 105 can include a carriage 109 configured to move up or down along or relative to a column 102 supporting the table 101. A second degree of freedom can allow the adjustable arm support 105 to tilt. For example, the adjustable arm support 105 can include a rotary joint, which can allow the adjustable arm support 105 to be aligned with the bed in a Trendelenburg position. A third degree of freedom can allow the adjustable arm support 105 to “pivot up,” which can be used to adjust a distance between a side of the table 101 and the adjustable arm support 105. A fourth degree of freedom can permit translation of the adjustable arm support 105 along a longitudinal length of the table.

The surgical robotics system 100 in FIGS. 12 and 13 can comprise a table supported by a column 102 that is mounted to a base 103. The base 103 and the column 102 support the table 101 relative to a support surface. A floor axis 131 and a support axis 133 are shown in FIG. 13.

The adjustable arm support 105 can be mounted to the column 102. In other embodiments, the arm support 105 can be mounted to the table 101 or base 103. The adjustable arm support 105 can include a carriage 109, a bar or rail connector 111 and a bar or rail 107. In some embodiments, one or more robotic arms mounted to the rail 107 can translate and move relative to one another.

The carriage 109 can be attached to the column 102 by a first joint 113, which allows the carriage 109 to move relative to the column 102 (e.g., such as up and down a first or vertical axis 123). The first joint 113 can provide the first degree of freedom (“Z-lift”) to the adjustable arm support 105. The adjustable arm support 105 can include a second joint 115, which provides the second degree of freedom (tilt) for the adjustable arm support 105. The adjustable arm support 105 can include a third joint 117, which can provide the third degree of freedom (“pivot up”) for the adjustable arm support 105. An additional joint 119 (shown in FIG. 13) can be provided that mechanically constrains the third joint 117 to maintain an orientation of the rail 107 as the rail connector 111 is rotated about a third axis 127. The adjustable arm support 105 can include a fourth joint 121, which can provide a fourth degree of freedom (translation) for the adjustable arm support 105 along a fourth axis 129.

FIG. 14 illustrates an end view of the surgical robotics system 140A with two adjustable arm supports 105A, 105B mounted on opposite sides of a table 101. A first robotic arm 142A is attached to the bar or rail 107A of the first adjustable arm support 105B. The first robotic arm 142A includes a base 144A attached to the rail 107A. The distal end of the first robotic arm 142A includes an instrument drive mechanism 146A that can attach to one or more robotic medical instruments or tools. Similarly, the second robotic arm 142B includes a base 144B attached to the rail 107B. The distal end of the second robotic arm 142B includes an instrument drive mechanism 146B. The instrument drive mechanism 146B can be configured to attach to one or more robotic medical instruments or tools.

In some embodiments, one or more of the robotic arms 142A, 142B comprises an arm with seven or more degrees of freedom. In some embodiments, one or more of the robotic arms 142A, 142B can include eight degrees of freedom, including an insertion axis (1-degree of freedom including insertion), a wrist (3-degrees of freedom including wrist pitch, yaw and roll), an elbow (1-degree of freedom including elbow pitch), a shoulder (2-degrees of freedom including shoulder pitch and yaw), and base 144A, 144B (1-degree of freedom including translation). In some embodiments, the insertion degree of freedom can be provided by the robotic arm 142A, 142B, while in other embodiments, the instrument itself provides insertion via an instrument-based insertion architecture.

C. Instrument Driver & Interface.

The end effectors of the system's robotic arms may comprise (i) an instrument driver (alternatively referred to as “instrument drive mechanism” or “instrument device manipulator”) that incorporates electro-mechanical means for actuating the medical instrument and (ii) a removable or detachable medical instrument, which may be devoid of any electro-mechanical components, such as motors. This dichotomy may be driven by the need to sterilize medical instruments used in medical procedures, and the inability to adequately sterilize expensive capital equipment due to their intricate mechanical assemblies and sensitive electronics. Accordingly, the medical instruments may be designed to be detached, removed, and interchanged from the instrument driver (and thus the system) for individual sterilization or disposal by the physician or the physician's staff. In contrast, the instrument drivers need not be changed or sterilized, and may be draped for protection.

FIG. 15 illustrates an example instrument driver. Positioned at the distal end of a robotic arm, instrument driver 62 comprises one or more drive units 63 arranged with parallel axes to provide controlled torque to a medical instrument via drive shafts 64. Each drive unit 63 comprises an individual drive shaft 64 for interacting with the instrument, a gear head 65 for converting the motor shaft rotation to a desired torque, a motor 66 for generating the drive torque, an encoder 67 to measure the speed of the motor shaft and provide feedback to the control circuitry, and control circuitry 68 for receiving control signals and actuating the drive unit. Each drive unit 63 being independently controlled and motorized, the instrument driver 62 may provide multiple (four as shown in FIG. 15) independent drive outputs to the medical instrument. In operation, the control circuitry 68 would receive a control signal, transmit a motor signal to the motor 66, compare the resulting motor speed as measured by the encoder 67 with the desired speed, and modulate the motor signal to generate the desired torque.

For procedures that require a sterile environment, the robotic system may incorporate a drive interface, such as a sterile adapter connected to a sterile drape, that sits between the instrument driver and the medical instrument. The chief purpose of the sterile adapter is to transfer angular motion from the drive shafts of the instrument driver to the drive inputs of the instrument while maintaining physical separation, and thus sterility, between the drive shafts and drive inputs. Accordingly, an example sterile adapter may comprise a series of rotational inputs and outputs intended to be mated with the drive shafts of the instrument driver and drive inputs on the instrument. Connected to the sterile adapter, the sterile drape, comprised of a thin, flexible material such as transparent or translucent plastic, is designed to cover the capital equipment, such as the instrument driver, robotic arm, and cart (in a cart-based system) or table (in a table-based system). Use of the drape would allow the capital equipment to be positioned proximate to the patient while still being located in an area not requiring sterilization (i.e., non-sterile field). On the other side of the sterile drape, the medical instrument may interface with the patient in an area requiring sterilization (i.e., sterile field).

D. Medical Instrument.

FIG. 16 illustrates an example medical instrument with a paired instrument driver. Like other instruments designed for use with a robotic system, medical instrument 70 comprises an elongated shaft 71 (or elongate body) and an instrument base 72. The instrument base 72, also referred to as an “instrument handle” due to its intended design for manual interaction by the physician, may generally comprise rotatable drive inputs 73, e.g., receptacles, pulleys or spools, that are designed to be mated with drive outputs 74 that extend through a drive interface on instrument driver 75 at the distal end of robotic arm 76. When physically connected, latched, and/or coupled, the mated drive inputs 73 of the instrument base 72 may share axes of rotation with the drive outputs 74 in the instrument driver 75 to allow the transfer of torque from the drive outputs 74 to the drive inputs 73. In some embodiments, the drive outputs 74 may comprise splines that are designed to mate with receptacles on the drive inputs 73.

The elongated shaft 71 is designed to be delivered through either an anatomical opening or lumen, e.g., as in endoscopy, or a minimally invasive incision, e.g., as in laparoscopy. The elongated shaft 71 may be either flexible (e.g., having properties similar to an endoscope) or rigid (e.g., having properties similar to a laparoscope) or contain a customized combination of both flexible and rigid portions. When designed for laparoscopy, the distal end of a rigid elongated shaft may be connected to an end effector extending from a jointed wrist formed from a clevis with at least one degree of freedom and a surgical tool or medical instrument, such as, for example, a grasper or scissors, that may be actuated based on force from the tendons as the drive inputs rotate in response to torque received from the drive outputs 74 of the instrument driver 75. When designed for endoscopy, the distal end of a flexible elongated shaft may include a steerable or controllable bending section that may be articulated and bent based on torque received from the drive outputs 74 of the instrument driver 75.

Torque from the instrument driver 75 is transmitted down the elongated shaft 71 using tendons along the elongated shaft 71. These individual tendons, such as pull wires, may be individually anchored to individual drive inputs 73 within the instrument handle 72. From the handle 72, the tendons are directed down one or more pull lumens along the elongated shaft 71 and anchored at the distal portion of the elongated shaft 71, or in the wrist at the distal portion of the elongated shaft. During a surgical procedure, such as a laparoscopic, endoscopic or hybrid procedure, these tendons may be coupled to a distally mounted end effector, such as a wrist, grasper, or scissor. Under such an arrangement, torque exerted on drive inputs 73 would transfer tension to the tendon, thereby causing the end effector to actuate in some way. In some embodiments, during a surgical procedure, the tendon may cause a joint to rotate about an axis, thereby causing the end effector to move in one direction or another. Alternatively, the tendon may be connected to one or more jaws of a grasper at the distal end of the elongated shaft 71, where tension from the tendon causes the grasper to close.

In endoscopy, the tendons may be coupled to a bending or articulating section positioned along the elongated shaft 71 (e.g., at the distal end) via adhesive, control ring, or other mechanical fixation. When fixedly attached to the distal end of a bending section, torque exerted on the drive inputs 73 would be transmitted down the tendons, causing the softer, bending section (sometimes referred to as the articulable section or region) to bend or articulate. Along the non-bending sections, it may be advantageous to spiral or helix the individual pull lumens that direct the individual tendons along (or inside) the walls of the endoscope shaft to balance the radial forces that result from tension in the pull wires. The angle of the spiraling and/or spacing therebetween may be altered or engineered for specific purposes, wherein tighter spiraling exhibits lesser shaft compression under load forces, while lower amounts of spiraling results in greater shaft compression under load forces, but limits bending. On the other end of the spectrum, the pull lumens may be directed parallel to the longitudinal axis of the elongated shaft 71 to allow for controlled articulation in the desired bending or articulable sections.

In endoscopy, the elongated shaft 71 houses a number of components to assist with the robotic procedure. The shaft 71 may comprise a working channel for deploying surgical tools (or medical instruments), irrigation, and/or aspiration to the operative region at the distal end of the shaft 71. The shaft 71 may also accommodate wires and/or optical fibers to transfer signals to/from an optical assembly at the distal tip, which may include an optical camera. The shaft 71 may also accommodate optical fibers to carry light from proximally-located light sources, such as light emitting diodes, to the distal end of the shaft 71.

At the distal end of the instrument 70, the distal tip may also comprise the opening of a working channel for delivering tools for diagnostic and/or therapy, irrigation, and aspiration to an operative site. The distal tip may also include a port for a camera, such as a fiberscope or a digital camera, to capture images of an internal anatomical space. Relatedly, the distal tip may also include ports for light sources for illuminating the anatomical space when using the camera.

In the example of FIG. 16, the drive shaft axes, and thus the drive input axes, are orthogonal to the axis of the elongated shaft 71. This arrangement, however, complicates roll capabilities for the elongated shaft 71. Rolling the elongated shaft 71 along its axis while keeping the drive inputs 73 static results in undesirable tangling of the tendons as they extend off the drive inputs 73 and enter pull lumens within the elongated shaft 71. The resulting entanglement of such tendons may disrupt any control algorithms intended to predict movement of the flexible elongated shaft 71 during an endoscopic procedure.

FIG. 17 illustrates an alternative design for an instrument driver and instrument where the axes of the drive units are parallel to the axis of the elongated shaft of the instrument. As shown, a circular instrument driver 80 comprises four drive units with their drive outputs 81 aligned in parallel at the end of a robotic arm 82. The drive units, and their respective drive outputs 81, are housed in a rotational assembly 83 of the instrument driver 80 that is driven by one of the drive units within the assembly 83. In response to torque provided by the rotational drive unit, the rotational assembly 83 rotates along a circular bearing that connects the rotational assembly 83 to the non-rotational portion 84 of the instrument driver 80. Power and controls signals may be communicated from the non-rotational portion 84 of the instrument driver 80 to the rotational assembly 83 through electrical contacts that may be maintained through rotation by a brushed slip ring connection (not shown). In other embodiments, the rotational assembly 83 may be responsive to a separate drive unit that is integrated into the non-rotatable portion 84, and thus not in parallel to the other drive units. The rotational mechanism 83 allows the instrument driver 80 to rotate the drive units, and their respective drive outputs 81, as a single unit around an instrument driver axis 85.

Like earlier disclosed embodiments, an instrument 86 may comprise an elongated shaft portion 88 and an instrument base 87 (shown with a transparent external skin for discussion purposes) comprising a plurality of drive inputs 89 (such as receptacles, pulleys, and spools) that are configured to receive the drive outputs 81 in the instrument driver 80. Unlike prior disclosed embodiments, the instrument shaft 88 extends from the center of the instrument base 87 with an axis substantially parallel to the axes of the drive inputs 89, rather than orthogonal as in the design of FIG. 16.

When coupled to the rotational assembly 83 of the instrument driver 80, the medical instrument 86, comprising instrument base 87 and instrument shaft 88, rotates in combination with the rotational assembly 83 about the instrument driver axis 85. Since the instrument shaft 88 is positioned at the center of instrument base 87, the instrument shaft 88 is coaxial with instrument driver axis 85 when attached. Thus, rotation of the rotational assembly 83 causes the instrument shaft 88 to rotate about its own longitudinal axis. Moreover, as the instrument base 87 rotates with the instrument shaft 88, any tendons connected to the drive inputs 89 in the instrument base 87 are not tangled during rotation. Accordingly, the parallelism of the axes of the drive outputs 81, drive inputs 89, and instrument shaft 88 allows for the shaft rotation without tangling any control tendons.

FIG. 18 illustrates an instrument having an instrument based insertion architecture in accordance with some embodiments. The instrument 150 can be coupled to any of the instrument drivers discussed above. The instrument 150 comprises an elongated shaft 152, an end effector 162 connected to the shaft 152, and a handle 170 coupled to the shaft 152. The elongated shaft 152 comprises a tubular member having a proximal portion 154 and a distal portion 156. The elongated shaft 152 comprises one or more channels or grooves 158 along its outer surface. The grooves 158 are configured to receive one or more wires or cables 180 therethrough. One or more cables 180 thus run along an outer surface of the elongated shaft 152. In other embodiments, cables 180 can also run through the elongated shaft 152. Manipulation of the one or more cables 180 (e.g., via an instrument driver) results in actuation of the end effector 162.

The instrument handle 170, which may also be referred to as an instrument base, may generally comprise an attachment interface 172 having one or more mechanical inputs 174, e.g., receptacles, pulleys or spools, that are designed to be reciprocally mated with one or more torque couplers on an attachment surface of an instrument driver.

In some embodiments, the instrument 150 comprises a series of pulleys or cables that enable the elongated shaft 152 to translate relative to the handle 170. In other words, the instrument 150 itself comprises an instrument-based insertion architecture that accommodates insertion of the instrument, thereby minimizing the reliance on a robot arm to provide insertion of the instrument 150. In other embodiments, a robotic arm can be largely responsible for instrument insertion.

E. Controller.

Any of the robotic systems described herein can include an input device or controller for manipulating an instrument attached to a robotic arm. In some embodiments, the controller can be coupled (e.g., communicatively, electronically, electrically, wirelessly and/or mechanically) with an instrument such that manipulation of the controller causes a corresponding manipulation of the instrument e.g., via master slave control.

FIG. 19 is a perspective view of an embodiment of a controller 182. In the present embodiment, the controller 182 comprises a hybrid controller that can have both impedance and admittance control. In other embodiments, the controller 182 can utilize just impedance or passive control. In other embodiments, the controller 182 can utilize just admittance control. By being a hybrid controller, the controller 182 advantageously can have a lower perceived inertia while in use.

In the illustrated embodiment, the controller 182 is configured to allow manipulation of two medical instruments, and includes two handles 184. Each of the handles 184 is connected to a gimbal 186. Each gimbal 186 is connected to a positioning platform 188.

As shown in FIG. 19, each positioning platform 188 includes a SCARA arm (selective compliance assembly robot arm) 198 coupled to a column 194 by a prismatic joint 196. The prismatic joints 196 are configured to translate along the column 194 (e.g., along rails 197) to allow each of the handles 184 to be translated in the z-direction, providing a first degree of freedom. The SCARA arm 198 is configured to allow motion of the handle 184 in an x-y plane, providing two additional degrees of freedom.

In some embodiments, one or more load cells are positioned in the controller. For example, in some embodiments, a load cell (not shown) is positioned in the body of each of the gimbals 186. By providing a load cell, portions of the controller 182 are capable of operating under admittance control, thereby advantageously reducing the perceived inertia of the controller while in use. In some embodiments, the positioning platform 188 is configured for admittance control, while the gimbal 186 is configured for impedance control. In other embodiments, the gimbal 186 is configured for admittance control, while the positioning platform 188 is configured for impedance control. Accordingly, for some embodiments, the translational or positional degrees of freedom of the positioning platform 188 can rely on admittance control, while the rotational degrees of freedom of the gimbal 186 rely on impedance control.

F. Navigation and Control.

Traditional endoscopy may involve the use of fluoroscopy (e.g., as may be delivered through a C-arm) and other forms of radiation-based imaging modalities to provide endoluminal guidance to an operator physician. In contrast, the robotic systems contemplated by this disclosure can provide for non-radiation-based navigational and localization means to reduce physician exposure to radiation and reduce the amount of equipment within the operating room. As used herein, the term “localization” may refer to determining and/or monitoring the position of objects in a reference coordinate system. Technologies such as preoperative mapping, computer vision, real-time EM tracking, and robot command data may be used individually or in combination to achieve a radiation-free operating environment. In other cases, where radiation-based imaging modalities are still used, the preoperative mapping, computer vision, real-time EM tracking, and robot command data may be used individually or in combination to improve upon the information obtained solely through radiation-based imaging modalities.

FIG. 20 is a block diagram illustrating a localization system 90 that estimates a location of one or more elements of the robotic system, such as the location of the instrument, in accordance to an example embodiment. The localization system 90 may be a set of one or more computer devices configured to execute one or more instructions. The computer devices may be embodied by a processor (or processors) and computer-readable memory in one or more components discussed above. By way of example and not limitation, the computer devices may be in the tower 30 shown in FIG. 1, the cart 11 shown in FIGS. 1-4, the beds shown in FIGS. 5-14, etc.

As shown in FIG. 20, the localization system 90 may include a localization module 95 that processes input data 91-94 to generate location data 96 for the distal tip of a medical instrument. The location data 96 may be data or logic that represents a location and/or orientation of the distal end of the instrument relative to a frame of reference. The frame of reference can be a frame of reference relative to the anatomy of the patient or to a known object, such as an EM field generator (see discussion below for the EM field generator).

The various input data 91-94 are now described in greater detail. Preoperative mapping may be accomplished through the use of the collection of low dose CT scans. Preoperative CT scans are reconstructed into three-dimensional images, which are visualized, e.g. as “slices” of a cutaway view of the patient's internal anatomy. When analyzed in the aggregate, image-based models for anatomical cavities, spaces and structures of the patient's anatomy, such as a patient lung network, may be generated. Techniques such as center-line geometry may be determined and approximated from the CT images to develop a three-dimensional volume of the patient's anatomy, referred to as model data 91 (also referred to as “preoperative model data” when generated using only preoperative CT scans). The use of center-line geometry is discussed in U.S. patent application Ser. No. 14/523,760, the contents of which are herein incorporated in its entirety. Network topological models may also be derived from the CT-images, and are particularly appropriate for bronchoscopy.

In some embodiments, the instrument may be equipped with a camera to provide vision data (or image data) 92. The localization module 95 may process the vision data 92 to enable one or more vision-based (or image-based) location tracking modules or features. For example, the preoperative model data 91 may be used in conjunction with the vision data 92 to enable computer vision-based tracking of the medical instrument (e.g., an endoscope or an instrument advance through a working channel of the endoscope). For example, using the preoperative model data 91, the robotic system may generate a library of expected endoscopic images from the model based on the expected path of travel of the endoscope, each image linked to a location within the model. Intraoperatively, this library may be referenced by the robotic system in order to compare real-time images captured at the camera (e.g., a camera at a distal end of the endoscope) to those in the image library to assist localization.

Other computer vision-based tracking techniques use feature tracking to determine motion of the camera, and thus the endoscope. Some features of the localization module 95 may identify circular geometries in the preoperative model data 91 that correspond to anatomical lumens and track the change of those geometries to determine which anatomical lumen was selected, as well as the relative rotational and/or translational motion of the camera. Use of a topological map may further enhance vision-based algorithms or techniques.

Optical flow, another computer vision-based technique, may analyze the displacement and translation of image pixels in a video sequence in the vision data 92 to infer camera movement. Examples of optical flow techniques may include motion detection, object segmentation calculations, luminance, motion compensated encoding, stereo disparity measurement, etc. Through the comparison of multiple frames over multiple iterations, movement and location of the camera (and thus the endoscope) may be determined.

The localization module 95 may use real-time EM tracking to generate a real-time location of the endoscope in a global coordinate system that may be registered to the patient's anatomy, represented by the preoperative model. In EM tracking, an EM sensor (or tracker) comprising one or more sensor coils embedded in one or more locations and orientations in a medical instrument (e.g., an endoscopic tool) measures the variation in the EM field created by one or more static EM field generators positioned at a known location. The location information detected by the EM sensors is stored as EM data 93. The EM field generator (or transmitter), may be placed close to the patient to create a low intensity magnetic field that the embedded sensor may detect. The magnetic field induces small currents in the sensor coils of the EM sensor, which may be analyzed to determine the distance and angle between the EM sensor and the EM field generator. These distances and orientations may be intraoperatively “registered” to the patient anatomy (e.g., the preoperative model) in order to determine the geometric transformation that aligns a single location in the coordinate system with a position in the preoperative model of the patient's anatomy. Once registered, an embedded EM tracker in one or more positions of the medical instrument (e.g., the distal tip of an endoscope) may provide real-time indications of the progression of the medical instrument through the patient's anatomy.

Robotic command and kinematics data 94 may also be used by the localization module 95 to provide localization data 96 for the robotic system. Device pitch and yaw resulting from articulation commands may be determined during preoperative calibration. Intraoperatively, these calibration measurements may be used in combination with known insertion depth information to estimate the position of the instrument. Alternatively, these calculations may be analyzed in combination with EM, vision, and/or topological modeling to estimate the position of the medical instrument within the network.

As FIG. 20 shows, a number of other input data can be used by the localization module 95. For example, although not shown in FIG. 20, an instrument utilizing shape-sensing fiber can provide shape data that the localization module 95 can use to determine the location and shape of the instrument.

The localization module 95 may use the input data 91-94 in combination(s). In some cases, such a combination may use a probabilistic approach where the localization module 95 assigns a confidence weight to the location determined from each of the input data 91-94. Thus, where the EM data may not be reliable (as may be the case where there is EM interference) the confidence of the location determined by the EM data 93 can be decrease and the localization module 95 may rely more heavily on the vision data 92 and/or the robotic command and kinematics data 94.

As discussed above, the robotic systems discussed herein may be designed to incorporate a combination of one or more of the technologies above. The robotic system's computer-based control system, based in the tower, bed and/or cart, may store computer program instructions, for example, within a non-transitory computer-readable storage medium such as a persistent magnetic storage drive, solid state drive, or the like, that, upon execution, cause the system to receive and analyze sensor data and user commands, generate control signals throughout the system, and display the navigational and localization data, such as the position of the instrument within the global coordinate system, anatomical map, etc.

2. Introduction to Medical Instruments for Cauterization

Embodiments of the disclosure relate to a medical instrument which can be used to cauterize tissue during a medical procedure. The medical instrument can be attached to an IDM at a distal end of a robotic arm such that the medical instrument can be controlled by a robotic system. An end effector located at the distal end of the medical instrument may be embodied as a metal piece (e.g., in the shape of a hook) and can cauterize (e.g., burn) a portion of a patient's anatomy in a controlled manner by applying a current to the metal piece (e.g., an articulating metal hook).

FIG. 21 illustrates an exemplary system in which a monopolar medical instrument, according to aspects of this disclosure, can be used for a medical procedure. The system 200 may include a generator 205 electrically coupled to an active electrical path 210 and a return electrical path 215, a patient 220, a grounding pad 225 electrically coupled to the patient 220, and a monopolar medical instrument 230. The generator 205 is configured to supply an electric current to the monopolar medical instrument 230 via the active path 210. The current may flow through the patient 220 from the monopolar medical instrument 230 to the grounding pad 225 before returning to the generator 205 via the return electrical path 215.

Due to the potential difference between the monopolar medical instrument 230 and the grounding pad 225, the end effector of the monopolar medical instrument 230 is charged with sufficient electrical energy to cauterize nearby tissue. In the embodiment of FIG. 21, the medical instrument 230 may be considered monopolar, rather than bipolar, since the end effector is supplied electrical current by only the active electrical path 210 with the return electrical path 215 completing the electrical circuit through the patient's 220 body via the grounding pad 225. Specific features of such a monopolar medical instrument 230 will be described below. However, one skilled in the art will appreciate that these features may not be limited to monopolar medical instruments, but could also be applied to various single-fingered wrist instruments (e.g., non-energy scalpel blades), bipolar instruments and other surgical tools as well.

There may be a number of design considerations associated with designing monopolar medical instruments. A first consideration is that the monopolar medical instrument 230 desirably burn/cauterize tissue in a controlled and predicable manner, without burning undesired tissue in a patient. Other types of medical instruments, such as certain types of bipolar needle drivers, may be formed of an all-metal construction, which may be resistant to wear when internal metal cables rub against internal surfaces. However, such an all-metal construction may not be practical for the monopolar medical instrument 230, since an all-metal construction may cause certain parts/portions of the monopolar medical instrument 230 to be electrically conductive in an undesirable manner. For example, when a certain part of the monopolar medical instrument 230 other than the end effector forms the shortest path to the grounding pad 225, current may flow from that certain part of the monopolar medical instrument 230 into surrounding tissue, potentially cauterizing the tissue in undesirable manner and harming the patient.

A second consideration is that the monopolar medical instrument 230 be designed to withstand wear and tear. As noted above, certain instruments, such as some bipolar needle drivers, may be formed of an all metal construction. Such instruments can be resistant to wear when internal metal cables run against internal stationary redirect surfaces. As used herein, a stationary redirect surface refers to a non-rotating surface along which a cable runs that alters the cable path traversed by the cable. In order to actuate portions of the end effector, one or more metal cables may be routed through the body of the medical instrument and the path taken by the metal cables may be redirected via one or more pulleys and/or one or more stationary redirect surfaces. However, as an all metal construction may be impractical due to undesirable burning, it may be beneficial to have one or more components formed of plastic. This can result in metal-on-plastic contact (e.g., the metal cables gliding over internal plastic surfaces), which can result in an increase in wear and tear.

A third design consideration includes, in the context of a robotic system, providing at least two degrees of freedom (DOF) of movement via articulation of the monopolar medical instrument 230. As described in further detail below, the monopolar medical instrument 230 may comprise a wrist that may articulate in 2 DOF via actuation of one or more of the cables or cable segments routed through at least a portion of the wrist. The cable(s) may be advanced and/or retracted by, e.g., an IDM coupled to the proximal end of the monopolar medical instrument 230 in order to articulate the wrist.

Providing 2 DOF articulation in the wrist, without significantly increasing the diameter of the monopolar medical instrument 230, may require redirecting the path traversed by the cables through the wrist in some circumstances. However, as noted above, if the wrist is formed of an electrically insulating and/or dielectric material (e.g., plastic) to address the first design consideration discussed above, the inclusion of a stationary redirect surface within the wrist may lead to premature wear due to the friction between the cables and the stationary redirect surface made of plastic or another insulating material. Once a stationary redirect surface has experienced wear (e.g., the cable has worn through the redirect surface creating a new path for the cable to traverse through the wrist), the redirect surface may no longer redirect the cable's traversal path in the intended direction, which can lead to unintended functionality. For example, a worn cable path may shorten the overall length of the path traveled by the cable through the wrist, which can lead to slack in the cable. The additional slack in the cable may have the effect of failing to articulate the wrist when advancing or retracting the cable over a certain distance which may only result in taking in the cable slack. In addition, having a metal cable glide over a plastic redirect surface can sometimes result in high wear rates that can leave high levels of particulate in a patient.

A. Example Monopolar Medical Instrument.

FIGS. 22A-22C illustrate a plurality of views of an embodiment of a monopolar medical instrument in accordance with aspects of this disclosure. In particular, FIG. 22A illustrates a view of a monopolar medical instrument 300 in which a wrist 301 including a distal clevis 305 and a proximal clevis 310 are visible. An end effector 315 is shown coupled to the distal clevis 305 via a distal axle 320 which is labeled in FIG. 22B.

FIG. 22B illustrates another view of the monopolar medical instrument 300 in which the distal clevis 305 and the proximal clevis 310 are transparent to provide a view of the internals of the wrist 301. As shown in FIG. 22B, the monopolar medical instrument 300 further includes the distal axle 320, a distal pulley 325, a conductive cable 330, a stationary redirect surface 335, a proximal axle 340, a set of proximal pulleys 345, a proximal redirect axle 350, a set of proximal redirect pulleys 355, a first cable 360, and a second cable 365.

The rotation of the distal pulley 325 and the proximal pulleys 345 around the respective distal axle 320 and the proximal axle 340 may provide 2 DOF articulation to the wrist 301. For example, the distal axle 320 may define a yaw axis around which the distal pulley 325, and thus the end effector 315, are configured to be articulated. Similarly, the proximal axle 340 may define a pitch axis around which the proximal pulleys 345, and thus the distal clevis 305, are configured to be articulated. The proximal pulleys 345 are configured to rotate with respect to a pitch axis providing a degree of freedom for articulation of the end effector 315. Similarly, the distal pulley 325 is configured to rotate with respect to a yaw axis providing another degree of freedom for articulation of the end effector 315. The proximal redirect pulleys 355 may be configured to provide a smooth redirect transition for the cable paths between the body of the monopolar medical instrument 300 and the proximal pulleys 345.

The first cable 360 traverses a first path within the wrist 301 so as to engage with the proximal redirect pulleys 355, the proximal pulleys 345, and the distal pulley 325. In contrast, the second cable 365 traverses a second path within the wrist 301 so as to engage with the proximal redirect pulleys 355 and the proximal pulleys 345 without engaging the distal pulley 325. The first and second cable 360 and 365 may be formed of metal or another wear-resistance material. In some embodiments, the first and/or second cable 360, 365 can be formed of tungsten or stainless steel. In some embodiments, the first and/or second cable 360, 365 can be formed of a high strength polymer, like a liquid-crystal polymer (e.g., Vectran™) or an ultra high molecular weight polymer (e.g., Dyneema®). The conductive cable 330 traverses a third path within the wrist 301 so as to engage with the proximal redirect pulleys 355, the proximal pulleys 345, and the distal pulley 325. The conductive cable 330 may be formed of an electrically conductive material and electrically connected to the end effector 315. The conductive cable 330 may also be electrically connected to the active electrical path 210 (shown in FIG. 21) so as to supply a current to the end effector 315. In some embodiments, the conductive cable 330 comprises an electrically conductive core with a non-conductive jacket around it.

As explained above in the Introduction to Medical Instruments for Cauterization section, one design consideration for a monopolar medical instrument is providing a structure in which electrical current is applied to the patient's anatomy in a controller manner—namely, from only the end effector 315, as opposed to other parts of the monopolar medical instrument 300. Accordingly, the distal clevis 305 and/or the proximal clevis 310 may be formed of one or more electrically insulating materials to prevent the current applied to the conductive cable 315 from being transmitted to the patient's anatomy via the distal clevis 305 and/or the proximal clevis 310. In some embodiments, both the proximal clevis 310 and the distal clevis 305 are formed of an electrically insulating material, while in other embodiments, only one of the proximal clevis 310 and the distal clevis 305 are formed of an electrically insulating material. In certain embodiments, the distal pulley 325, the proximal pulleys 345, and the proximal redirect pulleys 355 may also be formed of one or more electrically insulating materials to electrically isolate the pulleys 325, 345, and 355 from the conductive cable 330. However, in other embodiments, the distal pulley 325, the proximal pulleys 345, and the proximal redirect pulleys 355 may also be formed of one or more metal materials, which may reduce wear on the pulleys 325, 345, and 355. In certain embodiments, the one or more electrically insulating materials may include plastic.

The wrist may be capable of 2 DOF movement in the yaw and pitch directions (e.g., movement with respect to the distal axle 320 defining the yaw axis and with respect to the proximal axle 340 defining the pitch axis). In particular, advancing or retracting segments of the first cable 360 and/or the second cable 365 may cause movement of the wrist in one or two of the 2 DOF of movement.

FIG. 22C illustrates how the first cable 360 and the second cable 365 engage with the wrist 301. In order to actuate the wrist 301 in the 2 DOF of movement, the first cable 360 and the second cable 365 apply forces at certain positions within the wrist. More specifically, the second cable 365 engages a plastic component 370 formed in the distal clevis 305 to apply a force to the distal clevis 305. Accordingly, the second cable 365 may terminate in the distal clevis 305 at the plastic component 370.

In the embodiment illustrated in FIG. 22C, the second cable 365 may not need to move along the plastic component 370. That is, each side of the second cable 365 may be either advanced or retracted at the same rate. Accordingly, the second cable 365 does not need to be fastened, or otherwise physically connected, to the plastic component 370. Further, since the second cable 365 does not need to travel along the plastic component 370, the plastic component 370 will not experience significant wear due to friction with the second cable 365. It is noted that, in other embodiments, the component 370 may be made of non-metal materials other than plastic, including but not limited to other dielectric materials.

With continued reference to FIG. 22C, the first cable 360 engages with the distal pulley 325. In order to rotate the distal pulley 325 with respect to the distal axle 320, one side of the first cable 360 may be advanced while the other side is retracted, or vice versa. To prevent slippage between the first cable 360 and the distal pulley 325, the first cable 360 may be fastened to the distal pulley 325 via a fastener 375 (as shown in FIG. 23).

B. Example Cable Path.

Certain articulable wrists may use stationary redirect surfaces to alter the cable path so as to apply forces to the appropriate locations within an articulatable wrist. However, when the distal clevis 305 and the proximal clevis 310 are formed of an electrically insulating material as in the embodiment of FIGS. 22A-22C, the use of such stationary redirect surfaces to engage with the actuation cables (e.g., the first cable 360 and the second cable 365) may cause premature wear on the redirect surfaces due to friction occurring as the cables move along the stationary redirect surfaces.

In order to prevent such wear on the electrically insulating materials used in the wrist 301, certain aspects of this disclosure relate to the use of cable path(s) that are free of stationary redirect surfaces. FIG. 23 illustrates an embodiment of a cable path which may be used to redirect the cables of the medical instrument illustrated in FIGS. 22A-22C. As shown in FIG. 23, the first cable 360 includes two first cable segments 361 and 363 connected to the distal pulley 325 at a fastener 375. The first cable segments 361 and 363 engage two of the proximal pulleys 345 and two of the proximal redirect pulleys 355. As described above, the first cable 360 may rotate the distal pulley 325 by advancing the first cable segment 361 while the other first cable segment 363 is retracted, or vice versa.

The second cable 365 includes two second cable segments 367 and 369 which engage two of the proximal pulleys 345 and two of the proximal redirect pulleys 355. The proximal pulleys 345 and the proximal redirect pulleys 355 engaged by the second cable 365 may be located closer to a central axis of the wrist 301 than the proximal pulleys 345 and the proximal redirect pulleys 355 engaged by the first cable 365. Such a routing of the cable path for the first cable 360 provides a greater distance between the fastener 375 and the distal axle 320, increasing the leverage (e.g., the moment arm) of the force applied to the distal pulley 325 by the first cable 360. In addition, this pulley configuration helps to maximize the diameter of the proximal pulleys 345, which increase the lever arm for pitch.

As is clear from the illustration in FIG. 23, neither the first cable 360 nor the second cable 365 engages with a stationary redirect surface within the wrist 301. Accordingly, any premature wear of the wrist 301 due to friction from one of the first cable 360 and the second cable 365 running over a stationary redirect surface can be prevented or minimized. Further, by employing such a cable path without the use of stationary redirect surfaces for the first cable 360 and the second cable 365, the tool life can be increased. Since the distal clevis 305 is formed of an electrically insulating material, the risk of stray currents from undesirably damaging tissue while using the monopolar medical instrument is reduced.

Although the cable path of FIG. 23 is free from stationary redirect surfaces for each of the first cable 360 and the second cable 365, the conductive cable 330 may still run over a stationary redirect surface 335, as shown in FIG. 22B. However, since the conductive cable 330 need not be used to drive actuation of any component in the wrist 301, the forces applied to the conductive cable 330 are less than in the first cable 360 and the second cable 365. Thus, the friction occurring as the conductive cable 330 runs along the stationary redirect surface 335 would likely not cause sufficient wear to adversely affect the tool life. In some embodiments, the conductive cable 330 can be in the form of a conductive cable that is coated with a low friction jacket, such as a PTFE jacket. This can advantageously help aid in friction reduction.

In the FIG. 23 embodiment, each of the first cable segments 361 and 363 extends substantially linearly from the proximal pulleys 345 to the distal pulley 325. Additionally, the two paths defined by the first cable 360 and the second cable 365 within the wrist 301 may be asymmetric with respect to each other. That is, the first cable 360 may engage the distal pulley 325 without the second cable 365 engaging the distal pulley 325. Thus, the first cable 360 may traverse a longer path through the wrist 301 than the second cable 365. In some embodiments, due to the asymmetric cable paths, there is no 180 degree rotational symmetry about the instrument shaft axis. Despite the asymmetry formed by the particular cable paths, as shown in FIG. 23, there is a mirror symmetry across a plane that is perpendicular to and bisecting the pitch axis.

The distal pulley 325 can be rotated with respect to the distal axle 320 (e.g., actuation in the yaw direction) such that one of the first cable segments 361 and 363 is advanced while the other of the first cable segments 361 and 363 is retracted, or vice versa for rotation in the opposite direction. To actuate the wrist 301 with respect to the proximal axle 340 (e.g., actuation in the pitch direction), one of the set of first cable segments 361 and 363 or the set of second cable segments 367 and 369 is advanced together while the other of the set of first cable segments 361 and 363 or the set of second cable segments 367 and 369 is retracted, or vice versa for rotation in the opposite direction.

The cable path illustrated in FIG. 23 may enable the wrist 301 (and thus the monopolar hook) to be actuated in accordance with an N+1 actuation technique, where N is a number of degrees of freedom in which the wrist 301 is configured to be actuated and N+1 is a number of cable segments configured to control actuation of the wrist. However, in certain embodiments, the second cable 365 may be configured such that it does not individually provide a DOF of movement. That is, the second cable 365 may be configured such that the second cable segments 367 and 369 can only be advanced and/or retracted together. In some embodiments, under such configurations, the N+1 actuation technique is similar to wrists where N=3. This is advantageous as it enables the same handle mechanism to drive both 2 DOF and 3 DOF wrists, Thus, while the wrist 301 may be configured to be actuated similar to an N+1 actuation technique, in practice the number of DOFs for the wrist 301 may be less than N (e.g., 2 DOF).

C. Example Monopolar Hooks.

FIGS. 24A-24C illustrate a plurality of embodiments of monopolar hooks which may be used in a monopolar medical instrument in accordance with aspects of this disclosure. The embodiments illustrated in FIGS. 24A-24C may address certain design considerations, including but not limited to electrically isolating the monopolar hook from other metal components of the monopolar medical instrument, reducing the likelihood that the monopolar hook will be caught on other devices (e.g., a cannula) when the monopolar medical instrument is removed from a patient, etc.

As noted above, one design consideration involves electrically isolating the monopolar hook from other metal components, since without isolation the current supplied to the monopolar hook may short to other metal components. For example, since the distal axle 320 (see FIG. 22B) may be formed of metal, if the monopolar hook is anchored into the distal pulley 325 such that it intersects the distal axle 320, the distal axle 320 may short to the monopolar hook when the monopolar hook is charged. In some embodiments, it may be possible to anchor the monopolar hook into the distal pulley 325 with the last leg of the hook intersecting with the axis of the distal axle 320; however, in such “intersecting” cases, another bend may need to be introduced into the monopolar hook in order to have the same distal shape relative to the distal pulley. In such embodiments, the same distal shape advantageously assists in providing a combination surgical application, fitting through an 8 mm cannula and not getting caught on the edge of the cannula when removing the monopolar hook. In other embodiments, in “non-intersecting” cases, the last leg of the hook does not intersect with the axis of the distal axis 320, thereby reducing the risk of shorting.

In FIG. 24A, an end effector assembly 400 includes a monopolar hook 405, an insulating member 410 and a distal pulley 325. The insulating member 410 may insulate the base on the monopolar hook 405 for a certain length of the monopolar hook 405 extending from the distal pulley 325. In some embodiments, the base of the distal pulley 325 can also be formed at least in part of an insulative material. In some embodiments, the insulating member 410 and the base of the distal pulley 325 are formed of two different insulative materials. The insulative material for the insulating member for the base of the distal pulley 325 may need to be sturdier than the insulative material of the insulating member 410, as it will need to protect the base from the localized high temperatures created from the monopolar energy. As illustrated in FIG. 24A, the monopolar hook 405 forms an angle relative to distal axle 320 such that the monopolar hook 405 does not intersect the distal axle 320. The distal pulley 325 may include a base into which at least a portion of the monopolar hook 405 extends and which provides mechanical support to the monopolar hook 405. Thus, the base of the distal pulley 325 may be configured to receive the monopolar hook 405. Additionally, the distal pulley 325 of FIG. 24A may have a substantially symmetrical shape.

In the embodiment of FIG. 24B, an end effector assembly 420 includes a monopolar hook 405 and a distal pulley 327. The monopolar hook 405 includes a proximal link 407 and a distal link 409, where the proximal link 407 is angulated relative to the distal link 409. In other embodiments, the monopolar hook 405 comprises more than two links, such as three, four, or more. The proximal link 407 is configured to form an angle relative to a rotational axis 450 of the at least one distal pulley 327 such that the proximal link 407 does not intersect the distal axle 320, which is concentric with the rotational axis 450. For example, the proximal link 407 may form an angle relative to a coordinate system 445 defined at the rotational axis 450. Further, as illustrated in FIG. 24B, the central axis 430 of the proximal link 407 is separated or offset from the rotational axis 450 by a predetermined distance 435.

FIG. 24C shows another embodiment of an end effector assembly 460 including a monopolar hook 405, an insulating member 465, and a distal pulley 329. The insulating member 465 may insulate the base on the monopolar hook 405 for a certain length of the monopolar hook 405 extending from the distal pulley 329, similar to the insulating member 410 (shown in FIG. 24A). FIG. 24C also illustrates the connections between the first cable 360, including the two first cable segments 361 and 363, and the distal pulley 329 at a fastener 375. The conductive cable 330 is also illustrated as connecting to the distal pulley 329 at one side of the distal pulley 329. Although not shown in the figure, the conductive cable 330 is electrically connected to the monopolar hook 405 while maintaining electrical isolation from the distal axle 320.

As noted above, another design consideration involves reducing the likelihood that the monopolar hook will be caught on other devices (e.g., a cannula) when the monopolar medical instrument is removed from a patient. With reference to FIG. 24B, the distal link 409 may form an angle relative to a rotational axis 450 that is less than 90° with the X-axis of the coordinate system 445. In certain implementations, the monopolar medical instrument may be inserted through a cannula to perform a medical procedure. The cannula may define an inner lumen having a diameter similar to the overall diameter of the monopolar medical instrument. At certain angles between the distal link 409 and the coordinate system 445 (e.g., angles between the central axis 430 of the proximal link 407 and the X-axis of the coordinate system 445), the distal link 409 may be more likely to catch the cannula as the monopolar medical instrument is removed from the patient. However, when the angle between the distal link 409 and the X-axis of the coordinate system 445 is small enough (e.g., substantially less than 90°), the monopolar hook may be forced back, sliding along the cannula such that the monopolar hook is less likely to catch as the monopolar medical device is removed from the patient.

D. Example Distal Pulley for Monopolar Medical Instrument.

FIGS. 25A-25C illustrate a plurality of views of another embodiment of a distal pulley for a monopolar medical instrument in accordance with aspects of this disclosure. The embodiment of FIGS. 25A-25C may address another design consideration in which, for an asymmetric cable configuration, the first cable 360 is positioned off-center to engage with the distal pulley 325 on one side of the distal pulley 325. Since the first cable 360 is offset from the central axis of the wrist 301, only one side of the distal pulley 325 is held in place within the distal clevis 305 due to the tension in the first cable 360. As such, when an external force is applied to the end effector 315, the distal pulley 325, and the end effector 315 attached thereto, may not be able to depend on the tension of the first cable 360 alone to prevent the end effector 315 from being removed from the distal clevis 305. Thus, in the embodiment illustrated in FIGS. 25A-25C, to reduce the likelihood of the distal pulley 325 and end effector 315 from being separated from the distal clevis 305, the distal pulley 325 may include a channel 510 and the distal clevis 305 may include a pin boss 515. The pin boss 515 may be configured to slide into the channel 510 when the end effector 315 is rotated with respect to the distal axle (e.g., in the yaw axis) to or past the full range of rotation. Any rotation and/or articulation forces applied to the distal pulley 325 that may result in the end effector 315 and distal pulley 325 being pulled out of the distal clevis 305 are transferred to the distal clevis 305 through interference between the pin boss 515 and an edge of the channel 510. In other embodiments, the end effector 315 may include a metal pin (not illustrated) that is isolated from all other metal in the tool. In some embodiments, the metal pin is akin to the pin 320 in FIG. 22B.

D. Example Method for Actuating an End Effector in Multiple Degrees of Movement.

FIG. 26 is a flowchart illustrating an example method operable by a robotic system, or component(s) thereof, for actuating an end effector in multiple degrees of movement in accordance with aspects of this disclosure. For example, the steps of method 700 illustrated in FIG. 26 may be performed by processor(s) and/or other component(s) of a medical robotic system (e.g., robotically-enabled system 10) or associated system(s). For convenience, the method 700 is described as performed by the “system” in connection with the description of the method 700.

The method 700 begins at block 701. At block 705, the system may advance or retract at least one first cable segment that engages at least one proximal pulley and at least one distal pulley of an instrument. The instrument may be embodied as shown in FIGS. 22A-22C and may include a wrist 301 including a proximal clevis 310 and a distal clevis 305, where the end effector 315 coupled to the distal clevis 305. As shown in FIGS. 22A-22C, at least one proximal pulley 345 may be located in the proximal clevis 310 and the at least one distal pulley 325 may be located in the distal clevis 305.

At block 710, the system may advance or retract at least one second cable segment that engages the at least one proximal pulley 345 without engaging the at least one distal pulley 325. In certain implementations, the method 700 may involve rotating the end effector with respect to a yaw axis that extends through the at least one distal pulley 325 by advancing or retracting the at least one first cable segment, as shown in FIGS. 22C and 23. The method 700 ends at block 715.

3. Implementing Systems and Terminology

Implementations disclosed herein provide systems, methods and apparatus for an articulating medical instrument which may include a monopolar end effector.

It should be noted that the terms “couple,” “coupling,” “coupled” or other variations of the word couple as used herein may indicate either an indirect connection or a direct connection. For example, if a first component is “coupled” to a second component, the first component may be either indirectly connected to the second component via another component or directly connected to the second component.

The functions associated with the articulating medical instrument described herein may be stored as one or more instructions on a processor-readable or computer-readable medium. The term “computer-readable medium” refers to any available medium that can be accessed by a computer or processor. By way of example, and not limitation, such a medium may comprise random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory, compact disc read-only memory (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer. It should be noted that a computer-readable medium may be tangible and non-transitory. As used herein, the term “code” may refer to software, instructions, code or data that is/are executable by a computing device or processor.

The methods disclosed herein comprise one or more steps or actions for achieving the described method. The method steps and/or actions may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of steps or actions is required for proper operation of the method that is being described, the order and/or use of specific steps and/or actions may be modified without departing from the scope of the claims.

As used herein, the term “plurality” denotes two or more. For example, a plurality of components indicates two or more components. The term “determining” encompasses a wide variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure), ascertaining and the like. Also, “determining” can include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory) and the like. Also, “determining” can include resolving, selecting, choosing, establishing and the like.

The phrase “based on” does not mean “based only on,” unless expressly specified otherwise. In other words, the phrase “based on” describes both “based only on” and “based at least on.”

The previous description of the disclosed implementations is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these implementations will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other implementations without departing from the scope of the invention. For example, it will be appreciated that one of ordinary skill in the art will be able to employ a number corresponding alternative and equivalent structural details, such as equivalent ways of fastening, mounting, coupling, or engaging tool components, equivalent mechanisms for producing particular actuation motions, and equivalent mechanisms for delivering electrical energy. Thus, the present invention is not intended to be limited to the implementations shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. 

What is claimed is:
 1. A medical instrument, comprising: a wrist comprising a proximal clevis and a distal clevis; an end effector coupled to the distal clevis via a distal axle; at least one proximal pulley in the proximal clevis; at least one distal pulley in the distal clevis and coupled to the distal axle; and at least one first cable segment configured to engage the at least one proximal pulley and the at least one distal pulley, wherein the at least one first cable segment extends along a substantially linear path between the at least one proximal pulley and the at least one distal pulley.
 2. The instrument of claim 1, wherein the at least one first cable segment is configured to engage the at least one proximal pulley and the at least one distal pulley without engaging with stationary redirect surfaces between the at least one proximal pulley and the at least one distal pulley.
 3. The instrument of claim 1, wherein: the at least one cable segment is formed of metal, and the at least the distal clevis is formed of plastic.
 4. The instrument of claim 1, wherein the at least one cable segment has a fleet angle of about zero as the at least one cable segment extends between the at least one proximal pulley and the at least one distal pulley.
 5. The instrument of claim 1, wherein the at least one cable segment has a fleet angle greater than about zero as the at least one cable segment extends between the at least one proximal pulley and the at least one distal pulley.
 6. The instrument of claim 1, further comprising: at least one second cable segment configured to engage with the at least one proximal pulley without engaging the at least one distal pulley.
 7. The instrument of claim 6, wherein the at least one second cable segment is further configured to engage with the distal clevis at a single side of the distal clevis offset from a central axis of the wrist.
 8. The instrument of claim 6, wherein the at least one proximal pulley is configured to rotate with respect to a pitch axis providing a first degree of freedom for articulation of the end effector.
 9. The instrument of claim 8, wherein the at least one first cable segment and the at least one second cable segment have a mirror symmetry across a plane that is perpendicular to and bisecting the pitch axis.
 10. The instrument of claim 6, wherein the at least one first cable segment and the at least one second cable segment are asymmetric with respect to each other.
 11. The instrument of claim 6, further comprising: a proximal axle coupled to the at least one proximal pulley, wherein, to actuate the wrist, the at least one proximal pulley is configured to be rotated with respect to the proximal axle such that the at least one first cable segment is advanced while the at least one second cable segment is retracted.
 12. The instrument of claim 1, wherein: the at least one first cable segment comprises two first cable segments configured to engage the at least one distal pulley, and the at least one distal pulley is configured to be rotated with respect to the distal axle such that one of the two first cable segments is advanced while another of the two first cable segments is retracted.
 13. The instrument of claim 1, wherein the distal clevis comprises a surface area free of stationary redirect surfaces.
 14. The instrument of claim 13, wherein the distal clevis is completely devoid of any stationary redirect surfaces.
 15. The instrument of claim 1, wherein: the at least one proximal pulley is configured to rotate with respect to a pitch axis providing a first degree of freedom for articulation of the end effector, and the at least one distal pulley is configured to rotate with respect to a yaw axis providing a second degree of freedom for the articulation of the end effector.
 16. The instrument of claim 1, wherein the end effector comprises a monopolar hook.
 17. The instrument of claim 16, wherein the monopolar hook is offset from a rotational axis that extends through the at least one distal pulley in the distal clevis.
 18. The instrument of claim 16, wherein the monopolar hook comprises a first link angulated relative to a second link.
 19. The instrument of claim 18, wherein: the first link comprises a proximal link and the second link comprises a distal link, and the at least one distal pulley comprises a base into which the first link is configured to be received.
 20. The instrument of claim 19, wherein: the first link is configured to form an angle relative to a rotational axis of the at least one distal pulley, and the angle is configured to prevent the monopolar hook from catching on a cannula in response to removal of the instrument from the cannula.
 21. A medical instrument, comprising: a wrist comprising a proximal clevis and a distal clevis; an end effector coupled to the distal clevis via a distal axle; at least one proximal pulley in the proximal clevis; at least one distal pulley in the distal clevis and coupled to the distal axle; at least one first cable segment configured to engage the at least one proximal pulley and the at least one distal pulley, wherein the at least one cable segment extends along a path between the at least one proximal pulley and the at least one distal pulley; and at least one second cable segment configured to engage with the at least one proximal pulley.
 22. The instrument of claim 21, wherein the at least one first cable segment is configured to engage the at least one proximal pulley and the at least one distal pulley without engaging with stationary redirect surfaces between the at least one proximal pulley and the at least one distal pulley.
 23. The instrument of claim 21, wherein: the at least one cable segment is formed of metal, and the at least the distal clevis is formed of plastic.
 24. The instrument of claim 21, wherein the at least one cable segment has a fleet angle of about zero as the at least one cable segment extends between the at least one proximal pulley and the at least one distal pulley.
 25. The instrument of claim 21, wherein the at least one cable segment has a fleet angle greater than about zero as the at least one cable segment extends between the at least one proximal pulley and the at least one distal pulley.
 26. The instrument of claim 21, wherein the at least one second cable segment is further configured to: engage with the at least one proximal pulley without engaging the at least one distal pulley; and engage with the distal clevis at a single side of the distal clevis offset from a central axis of the wrist.
 27. The instrument of claim 21, wherein the at least one proximal pulley is configured to rotate with respect to a pitch axis providing a first degree of freedom for articulation of the end effector.
 28. The instrument of claim 27, wherein the at least one first cable segment and the at least one second cable segment have a mirror symmetry across a plane that is perpendicular to and bisecting the pitch axis.
 29. The instrument of claim 21, wherein the at least one first cable segment and the at least one second cable segment are asymmetric with respect to each other.
 30. The instrument of claim 21, further comprising: a proximal axle coupled to the at least one proximal pulley, wherein, to actuate the wrist, the at least one proximal pulley is configured to be rotated with respect to the proximal axle such that the at least one first cable segment is advanced while the at least one second cable segment is retracted. 